摘要
为研究快速热解时煤中HCN/NH3的析出规律与燃用此煤的循环流化床锅炉NOx生成趋势的关联性,一方面在高温沉降炉上,定速率给煤粉在830,880和930℃的温度下热解,分析产物中HCN/NH3的析出规律;另一方面在CFB锅炉上,稳定煤量时调整床温在830,880和930℃下运行,分析烟气中NOx的生成趋势,研究两方面的关联性。研究表明:随着温度的增加,HCN的热解析出量先略微减小后增加,NH3是先增加后减少,煤中不同的氮大量热分解产生HCN/NH3的温度区间不同。随着温度的增加,热解中析出的NOx前驱物与锅炉中生成的NOx均增加。煤样中NOx前驱物的热解析出规律随温度增加的变化会引起CFB锅炉生成NOx的增加,认为燃煤CFB锅炉存在一个NOx转化临界温度。
Correlation between the characteristics of ＇HCN/NH3 releasing from coal during rapid pyrolysis and the NOx formation trend in the circulating fluidized bed boiler that burns the same coal was studied. First, experiments were carried out in the high temperature drop tube furnace to analyze releasing characteristics of HCN/NH3 under the condition that pyrolysis temperatures are 830, 880 and 930 ℃, and the fed pulverized coal rate is constant; Second, experiments were carried out in the boiler which was maintained with a constant coal flow, and running at bed temperatures of 830℃, 880℃ and 930 ℃ to analyze NOx formation trend, and study the correlation of two experiments. Results indicate that as the temperature increases, the releasing amount of HCN decreases slightly first and then increases, meanwhile, that of NH3 increases first and then decreases; temperature ranges of HCN/NH3 releasing during pyrolysis of different nitrogen forms in coal are different. As the temperature increases, NOx precursors releasing during pyrolysis and NOx formation in the boiler will both increase. Changes of releasing trends of NOx precursors as the temperature increases will cause the increase of NOx formation in the CFB boiler; there exists a critical temperature for NOx transformation in coal-fired CFB boilers.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第35期47-52,共6页
Proceedings of the CSEE
基金
辽宁省电力有限公司2011年度科学技术项目(2011YB1023)~~
作者简介
曾光（1982），男，工学硕士，工程师，主要从事锅炉系统调整及试验的研究工作，zengguang0630@163．com
孙绍增（1963），男，教授，博士生导师，研究方向为清洁燃烧和污染控制技术，生物质的能量化利用，sunsz@hit．edu．cn；
赵志强（1966），男，高级工程师，研究方向为电站系统及热工控制自动化，zzqzz4001@sina．com；
赵义军（1981），男，博士，讲师，研究方向为生物能的利用和煤燃烧方向，zhaoyijun@hit．edu．cn。
